[Cryptography] Leo Marks' 1998 talk about WW2 SOE code-making and breaking

[Kent Borg]

On 1/16/26 3:43 AM, John Gilmore wrote:
> But in 1998, he gave a 23-minute talk on "Codes and Ciphers" at the
> Imperial War Museum in London.  That talk was recorded, and it's now
> online:
>
>    https://www.iwm.org.uk/collections/item/object/80017694

Very interesting.

I love that they broadcast vast amounts of dummy traffic to hide 
the increase in traffic for D-Day.

And the story of the double-agent they killed and dropped out of an 
airplane over Germany, along with a high quality codebook the SOE 
devised for a non-existent resistance inside Germany.


Question: What is a "worked out key"?


Thanks,

-kb//
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